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Centrifugal compound casting method of high-boron high-speed steel roller

A technology of centrifugal compounding and high-speed steel, which is applied in the field of metal casting, can solve problems such as complex operation and achieve good metallurgical bonding effect

Active Publication Date: 2015-01-21
YUNNAN HEAVY EQUIP MFG GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, in the production of high-boron high-speed steel rolls using the ordinary centrifugal composite casting method, in order to prevent the boron element in the outer layer of high-boron high-speed steel from being mixed into the roll core, it is necessary to add a transition layer to the roll core ductile iron and roll high-boron high-speed steel. Using the three-layer composite method to produce high-boron high-speed steel composite rolls requires three electric furnaces to smelt three materials at the same time, and the operation is complicated.

Method used

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  • Centrifugal compound casting method of high-boron high-speed steel roller

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Experimental program
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Effect test

Embodiment 1

[0021] A 500 kg intermediate frequency induction furnace is used to smelt the outer layer of high boron high speed steel, and a 3 ton power frequency induction furnace is used to smelt the transition layer and roll core ductile iron. The specific preparation process of the composite roll is:

[0022] 1) On a centrifuge with a rotating speed of 700 rpm, pour the outer layer of high-boron high-speed steel molten steel at a temperature of 1435°C. After pouring, add 0.8 kg per square meter of the inner surface area of ​​the high-boron high-speed steel roll body (0.8 kg / m 2 ), add the following mass ratio of the first protective agent: 30% O-type glass slag, 70% anhydrous sodium tetraborate, rotate for 5 minutes;

[0023] 2) When the inner surface temperature of the outer high-boron high-speed steel roll body is 1300°C, continue to pour the high-temperature ductile iron molten iron of the transition layer at a temperature of 1450°C on a centrifuge with a rotation speed of 700 rpm, ...

Embodiment 2

[0026] A 500 kg intermediate frequency induction furnace is used to smelt the outer layer of high boron high speed steel, and a 3 ton power frequency induction furnace is used to smelt the transition layer and roll core ductile iron. The specific preparation process of the composite roll is:

[0027] 1) On a centrifuge with a rotating speed of 750 rpm, pour the outer layer of high-boron high-speed steel molten steel at a temperature of 1470°C. After pouring, add 1.0 kg per square meter of the inner surface area of ​​the high-boron high-speed steel roll body (1.0 kg / m 2 ), add the following mass ratio of the first protective agent: 48% O-type glass slag, 52% anhydrous sodium tetraborate, rotate for 10 minutes;

[0028] 2) When the inner surface temperature of the outer high-boron high-speed steel roll body is 1350°C, continue to pour the high-temperature ductile iron molten iron of the transition layer at a temperature of 1470°C on a centrifuge with a rotation speed of 750 rpm,...

Embodiment 3

[0031] A 500 kg intermediate frequency induction furnace is used to smelt the outer layer of high boron high speed steel, and a 3 ton power frequency induction furnace is used to smelt the transition layer and roll core ductile iron. The specific preparation process of the composite roll is:

[0032] 1) On a centrifuge with a rotating speed of 720 rpm, pour the outer layer of high-boron high-speed steel molten steel at a temperature of 1460°C. After pouring, add 0.9 kg per square meter of the inner surface area of ​​the high-boron high-speed steel roll body (0.9 kg / m 2 ), add the first protective agent in the following mass ratio: 38% O-type glass slag, 62% anhydrous sodium tetraborate, and rotate for 8 minutes;

[0033] 2) When the inner surface temperature of the outer high-boron high-speed steel roll body is 1320°C, continue to pour the high-temperature ductile iron molten iron of the transition layer at a temperature of 1460°C on a centrifuge with a rotational speed of 720...

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Abstract

The invention provides a centrifugal compound casting method of a high-boron high-speed steel roller. The centrifugal compound casting method comprises the following steps of: only using two electric furnaces to respectively melt molten steel and molten iron; and casting for three times by casting high-boron high-speed steel on an outer layer on a centrifugal machine, adding a first protective agent, continuously casting molten spheroidal graphite cast iron on a transition layer on the centrifugal machine, adding a second protective agent, and casting the molten spheroidal graphite cast iron on a roller core in a static state, so that the metallurgical bonding of the high-boron high-speed compound steel roller can be realized. According to the high-boron high-speed steel roller produced by the invention, the process is simple and convenient. Not only can the good metallurgical bonding be realized between the high-boron high-speed steel on the outer layer and the molten spheroidal graphite cast iron on the transition layer, but also the good metallurgical bonding is realized between the molten spheroidal graphite cast iron on the transition layer and the molten spheroidal graphite cast iron on the roller core, so that the anti-tension strength of the transition layer reaches to be more than 680 Mpa. Therefore, the roller is safe and reliable to use, and has good benefits in popularization and application.

Description

technical field [0001] The invention relates to a composite casting method of rolls, in particular to a centrifugal composite casting method of high-boron high-speed steel rolls, and belongs to the technical field of metal casting. Background technique [0002] Rolls are one of the main spare parts consumed in steel rolling production, and their consumption is 5% to 15% of the cost of steel rolling production. Coupled with factors such as downtime, reduced production and increased equipment maintenance due to roll consumption, it will account for a higher proportion of production costs. The quality of the roll is not only related to the cost of rolling steel production and the production rate of the rolling mill, but also affects the quality of the rolled material to a large extent. With the development of steel rolling technology, the speed and automation of rolling mills have been continuously improved, and higher requirements have been put forward for the quality of roll...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D13/00B22D19/16
Inventor 郭红星符寒光蒋业华刘忠全窦永平周荣岑启宏雷永平
Owner YUNNAN HEAVY EQUIP MFG GRP